[ZEPPELIN-6070] Script for checking out PR to local

[pan3793]

What is this PR for?

The existing Python-based dev/test_zeppelin_pr.py seems complex and has been broken. I replace it with a simple shell script.

What type of PR is it?

This fixes a dev tool.

Todos

N/A

What is the Jira issue?

ZEPPELIN-6070

How should this be tested?

Tested manually.

$ apache-zeppelin git:(ZEPPELIN-6070) dev/checkout_zeppelin_pr.sh 4802
+ APACHE_ZEPPELIN_REMOTE_REPO_NAME=apache
+ [[ 1 -eq 0 ]]
+ FORCE=
+ getopts :f arg
+ shift 0
+ PR_NUM=4802
+ git fetch apache pull/4802/head:PR_4802
remote: Enumerating objects: 305, done.
remote: Counting objects: 100% (305/305), done.
remote: Compressing objects: 100% (123/123), done.
remote: Total 305 (delta 131), reused 293 (delta 130), pack-reused 0 (from 0)
Receiving objects: 100% (305/305), 74.27 KiB | 200.00 KiB/s, done.
Resolving deltas: 100% (131/131), completed with 37 local objects.
From github.com:apache/zeppelin
 * [new ref]             refs/pull/4802/head -> PR_4802
+ git checkout PR_4802
Switched to branch 'PR_4802'
$ apache-zeppelin git:(PR_4802) 

Screenshots (if appropriate)

Questions:

• Does the license files need to update? No.
• Is there breaking changes for older versions? No.
• Does this needs documentation? No.

[tbonelee]

It works as expected and LGTM

[pan3793]

Thanks, merged to master